US2013221882A1PendingUtilityA1

Motor driving circuit, motor driving apparatus having the same, and motor driving method

37
Assignee: SAMSUNG ELECTRO MECHPriority: Feb 29, 2012Filed: Feb 21, 2013Published: Aug 29, 2013
Est. expiryFeb 29, 2032(~5.6 yrs left)· nominal 20-yr term from priority
Inventors:Bon Young Gu
H02P 6/08H02P 23/22
37
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Claims

Abstract

Disclosed herein is a motor driving circuit including: a duty ratio detection unit that detects a duty ratio of input pulse-width-modulation applied to control a speed of a motor; a speed detection unit that detects the speed of the motor; and a driving control unit that detects a targeted speed corresponding to the duty ratio of the input pulse-width-modulation by using relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed that are previously stored and controls a driving of the motor so that the speed of the motor is equal to the targeted speed. By this configuration, a speed of the motor can be accurately controlled.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A motor driving circuit, comprising:
 a duty ratio detection unit that detects a duty ratio of input pulse-width-modulation applied to control a speed of a motor;   a speed detection unit that detects the speed of the motor; and   a driving control unit that detects a targeted speed corresponding to the duty ratio, of the input pulse-width-modulation by using relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed that are previously stored and controls a driving of the motor so that the speed of the motor is equal to the targeted speed.   
     
     
         2 . The motor driving circuit according to  claim 1 , further comprising: a storage unit in which the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed are stored. 
     
     
         3 . The motor driving circuit according to  claim 1 , wherein the storage unit stores the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed in a look up table form. 
     
     
         4 . The motor driving circuit according to  claim 2 , wherein the storage unit stores the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed in a linear function form of the targeted speed with respect to the duty ratio of the input pulse-width-modulation. 
     
     
         5 . The motor driving circuit according to  claim 4 , wherein the linear function of the targeted speed with respect to the duty ratio of the input pulse-width-modulation is represented by the following <Equation>.
   Targeted speed=Duty ratio of input pulse-width-modulation×Slope  a +Constant  b,    <Equation>
   where b is a minimum value of the targeted speed.   
     
     
         6 . The motor driving circuit according to  claim 2 , wherein the storage unit stores the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed in a form in which the look up table and the linear function of the targeted speed with respect to the duty ratio of the input pulse-width-modulation are combined with each other. 
     
     
         7 . The motor driving circuit according to  claim 5 , wherein the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed is configured in a form in which a plurality of linear functions having different slopes for each section of the duty ratio of the input pulse-width-modulation are combined with one another. 
     
     
         8 . The motor driving circuit according to  claim 1 , wherein the driving control unit includes:
 a detector that detects the targeted speed corresponding to the duty ratio of the input pulse-width-modulation by using the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed; and   a comparator that compares the speed of the motor with the targeted speed to ouput the comparison results.   
     
     
         9 . The motor driving circuit according to  claim 8 , wherein the driving control unit further includes:
 a controller that controls a duty ratio of a driving signal applied to the motor by using the comparison results; and   a driver that controls the driving of the motor so that the speed of the motor becomes the targeted speed by using the duty ratio of the driving signal.   
     
     
         10 . The motor driving circuit according to  claim 9 , wherein the controller performs a control to reduce the duty ratio of the driving signal when the speed of the motor is faster than the targeted speed in the comparison results and performs a control to increase the duty ratio of the driving signal when the speed of the motor is slower than the targeted speed in the comparison results. 
     
     
         11 . The motor driving circuit according to  claim 1 , wherein the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed is stored by previously reflecting error information for compensating for errors of the speed of the motor detected by the speed detection unit or the duty ratio of the input pulse-width-modulation detected by the duty detection unit. 
     
     
         12 . A motor driving apparatus, comprising:
 an external control circuit that generates and outputs input pulse-width-modulation as a command for controlling a motor at a desired speed; and   a motor driving circuit that receives the input pulse-width-modulation to detect a duty ratio of the input pulse-width-modulation, detects a speed of the motor, detects a targeted speed corresponding to the duty ratio of the input pulse-width-modulation by using relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed that are previously stored, and controls a driving of the motor so that the speed of the motor is equal to the targeted speed.   
     
     
         13 . The motor driving apparatus according to  claim 12 , wherein the motor driving circuit includes a storage unit in which the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed are stored. 
     
     
         14 . The motor driving apparatus according to  claim 13 , wherein the storage unit stores the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed in a look up table form. 
     
     
         15 . The motor driving apparatus according to  claim 13 , wherein the storage unit stores the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed in a linear function form of the targeted speed with respect to the duty ratio of the input pulse-width-modulation. 
     
     
         16 . The motor driving apparatus according to  claim 15 , wherein the linear function of the targeted speed with respect to the duty ratio of the input pulse-width-modulation is represented by the following <Equation>.
   Targeted speed=Duty ratio of input pulse-width-modulation×Slope  a +Constant  b,    <Equation>
   where b is a minimum value of the targeted speed.   
     
     
         17 . The motor driving apparatus according to  claim 13 , wherein the storage unit stores the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed in a form in which the look up table and the linear function of the targeted speed with respect to the duty ratio of the input pulse-width-modulation are combined with each other. 
     
     
         18 . The motor driving apparatus according to  claim 16 , wherein the relationship data between the duty ratio of the input pulse-width-modulation and the targeted speed are formed in a form in which plurality of different linear functions having different slopes for each section of the duty ratio of the input pulse-width-modulation are combined with one another. 
     
     
         19 . A motor driving method, comprising:
 detecting a duty ratio of input pulse-width-modulation applied to control a speed of a motor;   detecting the speed of the motor;   detecting a targeted speed corresponding to the duty ratio of the input pulse-width-modulation by using relationship data between the duty ratio of the input pulse-width-modulation and a targeted speed that are previously stored; and   controlling a driving of the motor so that the speed of the motor is equal to the targeted speed.   
     
     
         20 . The motor driving method according to  claim 19 , further comprising: after the detecting of the targeted speed, comparing the speed of the motor with the targeted speed to output the comparison results. 
     
     
         21 . The motor driving method according to  claim 20 , wherein at the controlling of the driving of the motor, the duty ratio of the driving signal applied to the motor is controlled by using the comparison results. 
     
     
         22 . The motor driving method according to  claim 21 , wherein at the controlling of the duty ratio of the driving signal,
 a control is performed to reduce the duty ratio of the driving signal when the speed of the motor is faster than the targeted speed in the comparison results and   a control is performed to increase the duty ratio of the driving signal when the speed of the motor is slower than the targeted speed in the comparison results.

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